Demographic response by a small epiphytic orchid

Area of Science:

• Ecology
• Botany
• Climate Change Biology

Background:

• Epiphytic plants, like orchids, are potentially vulnerable to climate change impacts.
• Field data on epiphyte responses to climate variability are scarce.
• Lepidopteran rupestris is an epiphytic orchid found in the Luquillo Experimental Forest, Puerto Rico.

Purpose of the Study:

• To investigate the association between short-term climate variations and the abundance of demographic stages in the epiphytic orchid Lepidopteran rupestris.
• To analyze the relationship between climate variables (precipitation and temperature) and population dynamics of L. rupestris over an 8-year period.

Main Methods:

• Cross-correlation analyses were employed to assess relationships.
• Abundance of seedlings, juveniles, adults, and fruits were analyzed.
• Population growth, colonization, and extinction rates were examined against precipitation and temperature data, including lagged responses.

Main Results:

• Significant negative correlations were found between seedling abundance and dry days.
• Fruit abundance showed a negative correlation with minimum average temperature (6-month lag).
• Adult abundance correlated negatively with maximum temperature (1-year lag).
• Population growth and colonization/extinction rates were not directly linked to climate variation from 2000-2007.

Conclusions:

• Observed associations suggest negative implications for L. rupestris due to projected drying trends in the Caribbean.
• Long-term monitoring is crucial for detecting and predicting climate change effects on orchid populations.
• Establishing long-term studies is essential for effective adaptive management of vulnerable orchid species.